Typewriter escapement and control devices therefor

ABSTRACT

In connection with an escapement which comprises a flying dog which for causing each escapement step of the carriage reaches out counter to the letter feed direction, there is provided a device which incidental to carriage return motion is operated by friction drag influence to block first said dog against outreaching movement and then to disengage said dog, the device being effective by a short advance movement of the carriage following the return movement to reapply the dog. The device is also operated by the tabulation control mechanism for durations of tabulating runs but not resultant to friction drag influence.

1451 Aug. 14, 1973 United States Patent 1191 Link llllll TYPEWRITERESCAPEMENT AND CONTROL DEVICES THEREFOR 197/94 197/82 197/84 R Schraderet W 8 b n r e u N k .m y w m mm ae MG 0 t n e v n l n 7 um t. 6 w I K[73] Assignee: Triumph Werke Nuernber A.G.,

Nuernberg, Germany Primary Examiner-Emest T. Wright, Jr. Attorney-JosephR. Spalla 0 7 9 1 0 30 t. n m 6 7 o N 0. m n. P A 21 22 [57] ABSTRACT Inconnection with an escapement which com flying dog which for causingeach esca [30] Foreign Application Priority Data Dec. 31, 1969Gen'nany...................

prises a pement step of the carriage reaches out counter to the letterfeed di- 94 9 17 being effective by a short advance movement of thecarriage following the return movement to rea pply the tion cong runsbut not 56] References Cited dog. The device is also operated by thetabula UNITED STATES PATENTS trol mechanism for durations of tabulatinresultant to friction drag influence.

12 Claims, 5 Drawing Figures 24 28 NN $N 77 77 99/99 llq llWalton...........z..t........

Wunderlich e z .1 e W h C S 9699 66 3 9999 11111 64225 69528 ,ololl. 2256 44395 3 ,22 33 2 Patented Aug. 14, 1973 3,752,289

2 Sheets-Sheet 2 INVENTOR 4 MANFRED LINK ATTORNEY TYPEWRITER ESCAPEMENTAND CONTROL DEVICES THEREFOR This invention relates to an escapementdevice embodying at least one pivotally displaceable escapement dogwhich normally is in engagement with a toothed escapement rack on atypewriter carriage. Said escape ment dog is mounted to have somecapacity for spring urged movement counter to the advance direction ofthe carriage, so that when it is transitorily pivotally moved free ofthe engaged rack tooth, through opera tion of a type key, it will thenspring-move counter to the advance direction of the carriage and into aposition to intercept the carriage by a next tooth on the saidescapement rack as the carriage advances.

Escapements of this kind, of course, must function reliably at hightyping speeds. In turn, high typing speeds necessitate a forcefulcarriage advance spring in order to accelerate the large-mass-carriagequickly. Under these circumstances, the escapement can not be consideredpurely in regard to its escapement function, but attention must be givenalso to other functions which have relation to the escapement, so thatsuch other functions in conformance with high typing speeds will also beperformed reliably. Furthermore, it is paramount to insure such controlby the escapement over the carriage so that even though the machine maybe incorrectly operated, as when two type bars collide, the escapementwill not loose control over the carriage.

For functionally effecting quiet carriage movements such as returnmovements, manual carriage movements, back spacing and tabulations, theescapement must also be appropriately controlled. In connection withcarriage tabulations, as also for returns, the carriage ultimately mustsettle at an exact position in reference to the printing point, that isthe normally effective escapement dog must be prevented from moving atooth space counter to the advance direction away from its normalcarriage holding position.

It is well known to increase the typing speed capability of a typewriterthrough an increased power carriage spring and to mount the escapementrack in a shockreducing manner, thereby to reduce the stresses and loadsto which the involved parts are subjected.

In a well-known escapement, see German Pat. No. 1,073,007, or U.S. Pat.No. 2,741,355, shock reduction is achieved by mounting an es-capementrack by elongate holes on pins of a carriage for movement parallel tothe carriage and such rack is spring loaded to cooperate with a dogwhich is spring biased to pivot and can slide parallel to the carriagein reference to an operating lever which operating lever also can pivotand slide, the sum of the stated relative motions of the rack and thedog parallel to the carriage being together smaller than the letter-feedpitch.

In distinction to the prior devices, the attainment of an advantage issought whereby the dog gets into its operative position before thecarriage reaches its next printing position. The aforesaid spring loadedslidably mounted escapement rack however is complex and involves arelatively large mass. Furthermore, since the escapement rack is mountedon studs, the total aggregative tolerances within the entire escapementdevice are great and obviously give rise to great disadvantages.

Another carriage escaping device, see the German Pat. No. 1,034,661 orU.S. Pat. No. 2,818,958 involves an escapement dog normally engaging arack, and the typing speed is also stated to have been increased. Ac-

cording to this construction, however, an interposer lever is pushedback into its rest position by a latch pawl toward the end of theescapement step, causing the next escapement trip release to depend onthis time cycle. However, in order to achieve the fastest possibleescapement performance at the carriage, it is essential to release therack at the earliest possible moment because the inertia of the largemass of the carriage takes time to be overcome.

One of the objects of the invention is to develop a carriage escapementwhich accommodates high speed operation and which, in addition, tocontrolling the carriage for stepwise advance, has also provision forcarrying out other functions, for example, quit carriage movements,namely, carriage returns, tabulations and also movements facilitated bya carriage release. It is also an object to accomplish this withoutadding parts to the escapement mechanism. The escapement furthermoresatisfies a condition so that during tabulating and back spacing, theescapement dog is prevented from moving in return direction and so thatat the end of such operations, the escapement will take correct controlover the carriage in respect to the printing point.

According to the invention an escapement tripping dog and a disengaginglever therefor have each a slot for mounting them pivotally and slidablydisplaceable on a bracket-supported stud, and a multi-armed lever ispivotally operable on said stud to first block the dog against slidingmovement in carriage return direction, and then effect its pivotaldisplacement while the dog is held blocked, the multi-armed lever andthe dog having several interengageable surfaces for the stated purposes.

In order to achieve the above without adding parts to the actualescapement, and to provide for additional, escapement related functions,the multi-armed lever has a link connected thereto by a one-way activepinand slot association for causing tabulating movements. Additionally,the multi-armed lever has a stud projecting from it into the operatingrange of a carriagecarried release bail. Still further, the multi-armedlever includes thereon a finger and a leaf spring wherebetween acarriage supported flat steel band is situated in frictional contacttherebetween. Also the multi-armed lever has a lug which by clockwisemovement of the controller will pivotally release the escapement dogafter first blocking it against outreaching movement in carriage returndirection.

An exemplary'embodiment of the invention is illustrated in the drawing,wherein,

FIG. 1 is a front perspective view showing a carriage escapement dog andcontrolling devices therefor in segregated aspect,

FIG. 2 is a front elevation of the escapement dog and controllingdevices therefor in normal condition,

FIG. 3 is similar to FIG. 2 but the escapement dog is shown pivotallyactuated and ready to be spring moved to a rightwardly outreachingposition,

FIG. 4 is similar to FIG. 3 but the dog has moved to a righwardlyoutreaching position on its way to a new tooth relation with anescapement rack, and

FIG. 5 is a front view showing an escapement dog control operated torelease the dog and block it against movement to outreaching position.

Referring generally to the figures in the drawing, there is shown,diagrammatically, a portion of a suitably conventional general framework51 of a typewriter having a mounting bracket 1 fastened thereto byscrews 2a at the elongate holes 2 of said bracket 1. As seen in FIGS. 1and 2 said bracket 1 includes a hole 3, and spaced leftwardly from it ahook formation 4. A stud 5 projects rigidly from said hole 3 forwardlythereof and has a parts-retaining ring 7 seated in a groove 6 thereof.The stud 5 carries a dog tripping lever 8 by a slot 9 in the latter.Such dog tripping lever 8 has a downwardly reaching arm 10 having anotch 11, and further has a ledge 12 bent forwardly from it andincluding a rearwardly reaching stop finger 13 engageable with said hookformation 4. An operating lever 14 for the escapement dog tripping lever8 underlies the ledge 12 of the latter and is suitably pivotallyoperable in response to the operation of any type key mechanism 52 or aspace bar mechanism 54 which are diagrammatically shown as including alinkage connected to the operating lever 14 to pivotally operate saiddog tripping lever 8. The bracket 1 carries eccentrically adjustablethereon a stud 15. The stud 15 is eccentrically positioned on acylindrical member 68 disposed in a circular opening or recess 70 in thebracket 1 and rotatable therein to change the position of the stud 15relative to the bracket 1. A contractile spring 17 is hooked at one endto said stud 15 and at the other end to the notch 11 of the dog trippinglever 8 so that the latter will normally reside with its stop finger 13resting downwardly against the bracket 1, as in FIG. 2. The dog 18 ismounted on the stud 5 through the medium of its slot 19, so that it canrotate and also slide on said stud 5. The dog 18 includes at its rightend an escapement tooth 20 and also includes close to its left end adownwardiy reaching tongue 21 with a rest surface 23 flanking the tongue21. Rightwardly, of the tongue 21 is a step formation 22 flanked by anupward recess forming an edge 24. A downreaching arm 25 of theescapement dog 18 has a hole 26 whereinto a contractile spring 27 ishooked to bias it counterclockwise. A lever 28 associated with theescapement dog 18 is carried by the stud 5 which is received in a hole28a formed in the lever 28, so that, in distinction to the dog trippinglever 8 and the dog 18, it is capable only of pivotal movement thereon.The lever 28 has at its right end a stud 30 and above the pivot stud 5,it has an upreaching arm or finger 31. A leaf spring 32 is riveted tothe lever 28 and is with tension bearing toward it. The lever 28embodies furthermore a leftwardly reaching arm ending in a curved edge34 and has also an ear 33. Also the lever 28 has bendable stop fingers35 and 36 for opposite cooperation with the bracket supported stud 15,thereby to define a range of pivotal movement mechanism such lever 28.The machine includes a conventional tabulating mechansim which is showndiagrammatically at 56 and includes a link 39 having accommodation in aslot 38 of the lever 28. The tabulating mechanism 56 is conventionallyoperable for the duration of its actuation to draw the link 39 down andthereby pivotally move and hold the lever 28 clockwise, as in FIG. 5.

A pin 40 on the bracket 1 carries pivotally a lever 41 and a bent branch42 of such lever 41 rests normally against the lower edge of bracket 1under the tension of the aforementioned contractile spring 27 which hasits other end hooked to the lever 41 at a hole 43. The lever 41 hasabove the pivot pin 40 a round ended arm 44 which by reason of thespring 27 always cushions the disengaging motion of the escapement dog18.

A typewriter carriage 58 shown, diagrammatically in FIG. 1, includesmovable therewith a rack 45 which has teetch 46 with which saidescapement dog 18 is normally engaged. Furthermore, there is mounted onthe carriage 58, extending parallel thereto, an escapement dog releasebail 48 which is capable of displacement transversely of its length onthe carriage 58, by means of diagonal slots 49 therein in cooperationwith studs 50 on the carriage 58, transverse displacement being effectedby endwise movement of said dog release bail 48 release through acarriage release lever 62, diagrammatically illustrated in FIG. 1,provided at the end of the carriage 58, and which is operable to pressdownwardly against the escapement dog release bail 48 to effect adiagonal movement downwardly as guided by the studs 50 received in thediagonal slots 49.

Each time a type key mechanism 52 or a space bar mechanism 54 of thetypewriter is operated, the lever 14 becomes transitorily operated, andby contact with the ledge 12 operates the dog tripping lever 8 clockwiseto the position seen in FIG. 3. In doing so, the right endportion of theledge 12 on the dog tripping lever 8 acts on the overlying surface 23 ofthe escapement dog 18 to rotate the latter clockwise on the stud 5,causing the dog tooth 20 to move clear of a tooth 46 on the rack 45which has engaged it, see FIG. 3. Meanwhile, the lever 28 remains in itsnormal position see FIGS. 1 and 2, wherein its finger 35 restscounter-clockwise against the eccentrically adjustable stud 15. When thedog tripping lever 8, against the influence of the spring 17, hasrotated the dog 18 for its tooth 20 to leave the rack 45, the spring 27becomes effective to move the dog 18 bodily, as allowed by the slot 19therein in the direction of the arrow B, see FIG. 4. In being so movedthe dog tooth 20 has moved rightwardly of the rack tooth 46 from whichit has been disengaged and the rack 45 meanwhile has remained stationarydue to the static inertia of the carriage 58. During a substantial partof the rightward movement of the dog 18 toward the FIG. 4 position, thedog tripping lever 8 has its ledge 12 underlying the surface 23 on thedog 18 and bearing rightwardly against the tongue 21 under the tensionof the spring 17. Because the dog tripping lever 8 is under the urge ofthe spring 17, it will follow the movement of the dog 18 rightwardlyfrom the FIG. 3 position toward the FIG. 4 position. However, as the dog18 near such FIG. 4 position, the dog tripping lever 8 becomesintercepted by contact of the right end of the ledge 12 with the edge 24on the lever 28, so that the dog surface 23 then moves rightwardly clearof the ledge 12 and the dog 18 under the influence of the spring 27 willthen snap freely counterclockwise to engage its tooth 20 with the nextrack tooth 46. These motions are taking place very rapidly and as thestatic energy of the carriage 58 is then overcome by a carriage feedspring, as is convention and shown diagrammatically at 60 in FIG. 1, thecarriage 58, see Arrow A in FIG. 2, moves the dog 18 on the stud 5 inletter feed direction to the limit of the right end of the slot 19 inthe dog 18. During this motion the dog tripping lever 8 is moved by theleft end of the dog 18 leftwardly so that the ledge 12 moves leftwardlybeyond the edge 34 on the lever 28. Finally, the positions of the partsare then normal again as shown in FIG. 2.

The lever 28 has normally a position in which a stop finger 35 thereinbears counterclockwise against the frame supported stud 15, see FIG. 1.In FIG. 2, a portion of said lever 28 is shown in normal position and itwill be seen that an ear 33 thereon is normally disposed slightly belowthe step formation 22 of the dog 18 and is spaced slightly rightwardlyfrom the edge 24.

For the duration of the carriage tabulations and carriage returns, lever28 takes up the clockwise operated position shown in FIG. 5. In takingup this positon, the ear 33 on the lever 28 first moves upwardly to bedisposed rightwardly of the edge 24 on the dog 18 so that the latter isthen blocked against significant rightward movement by the spring 27.Further pivotal movement of the lever 28 swings the dog 18 clockwisefree of the rack 45, but the ear 33 allows only a minimal rightwardmovement of the dog 18. Thus, a condition is established at the outsetof the carriage returns and tabulations to free the carriage 58 formovement, but to hold the dog 18 substantially in unextended position sothat the right end of the slot 19 therein is situated closely to thestud 5. At the end of the carriage return or tabulating runs, a usualmargin stop 64 or tabulating stop 66 is engaged and due to a usual shortcarriage overrun and return movement which then takes place, the lever28 will become frictionally dragged counter clockwise to its normalposition seen in FIG. 2 by operation of the upreaching finger 31 and theleaf spring 32 as explained below Consequently, the escapement dog 18 isthen in accurate control over the carriage in conformance with thetabulating or margin stop 66,64 which has been active. The operation ofthe lever 28 occurs incidental to tabulations clockwise for the durationof the tabulating run of the carriage 58 by a pull rod 39 to the FIG. 5position. Incidental to movements of the carriage 58 effected in returndirection, either by power or manually, the required clockwise movementof the lever 28 is effected by an element or band 47 which extends alongand is carried for movement with the carriage 58. Said band 47 isfrictionally contacted by the finger 31 and the leaf spring 32, and asthe carriage 58 is initially moved in return direction, the lever 28 isfrictionally dragged to the operated position seen in FIG. 5. Carriagereturn motions are effected a fractional letter space beyond the returnposition to be obtained, wherefore the carriage position, after a returnrun, is finally determined by the dog 18 after a fractional-spaceadvance movement. In such overrun and return movement, the lever 28becomes frictionally dragged to the normal position by operation of theupreaching finger 31 and the leaf spring 32 engaging the band 47 whereinits stop finger 35 engages the stud l5, and so that the escapement dog18 will engage the correct tooth 46 of the rack 45.

The lever 28 is also operated by the operation of the carriage releasebail 48, through downward action on the stud 30. Thus, upon therestoration of the bail 48, the carriage 58 will promptly settle incarriage feed direction and the lever 28 will become restored.

Due to the described form of the lever 28 in reference to the dog 18, itis possible normally for the escapement dog 18 to execute a free andrapid movement counter to the letter feed direction of the carriage andthe rack 45, and as an escapement step is being completed, theescapement is ready for renewed operation.

Furthermore, a minimum of parts are required to control the escapementdog 18 so that quiet movement of the carriage 58 is facilitated forcarriage returns, tabulations or carriage-release effected carriagemovements, and so that upon any such operations the escapement dog 18will assume control over the carriage 58 in the appropriate stepposition.

The invention claimed is: 1. In a business machine having relativelymovable first and second elements, the combination comprising: anescapement rack having teeth formed thereon and being associated withsaid first element for relative movement therewith along a predeterminedescapement path,

an escapement dog for permitting free movement between the relativelymovable first and second elements in one direction along the escapementpath and for controlling relative movement between the relativelymovable first and second elements in an escapement direction oppositesaid one direction along the escapement path,

said escapement dog having a tooth for engaging the teeth of saidescapement rack and being associated with said second element,

said escapement dog being pivotally and slidably supported about a pointon said second element for pivotal movement into engagement with saidescapement rack and for slidable movement along the escapement path,

a first resilient biasing means for urging said escapement dog intoengagement with said escapement rack and for urging said escapement dogagainst the movement of said escapement rack in the escapement directionalong the escapement path,

a control member associated with said second relatively movable elementand pivotally supported about the point on said second element, and

said control member being pivotally movable about the point on saidsecond element for acting on said escapement dog to block slidingmovement of said escapement dog about the point on said second elementin response to the urging of said first resilient biasing means and thendisengage said escapement dog from said escapement rack.

2. In a business machine according to claim 1, the

combination further comprising:

a trip lever associated with said second element for disengaging saidescapement dog from said escapement rack,

said trip lever being pivotally and slidably supported about the pointon said second element for pivotal movement to disengage said escapementdog from said escapement rack and for slidable movement along theescapement path,

a second resilient biasing means for urging said trip lever in a pivotaldirection to prevent disengagement of said escapement dog from saidescapement rack and for urging said trip lever along the escapement pathin the same direction as said first resilient biasing means urges saidescapement dog, and

said escapement dog having a projection formed thereon for engaging saidtrip lever to prevent sliding movement of said trip lever along theescapement path under the urging of said second resilient biasing meansin response to the escapement dog being moved pivotally about the pointon said second element by the operation of said control member. 3. In abusiness machine having relatively movable first and second elements,the combination comprising: an escapement rack having teeth formedthereon and being associated with said first element for relativemovement therewith along a predetermined escapement path,

an escapement dog for permititng free movement between the relativelymovable first and second elements in one direction along the escapementpath and for controlling relative movement between the relativelymovable first and second elements in an escapement direction oppositesaid one direction along the escapement path,

said escapement dog having a tooth for engaging the teeth of saidescapement rack and being associated with said second element,

said escapement dog being pivotally and slidably supported about a pointon said second element for pivotal movement into engagement with saidescapement rack and for slidable movement along the escapement path,

a first resilient biasing means for urging said escapement dog intoengagement with said escapement rack and for urging said escapement dogagainst the movement of said escapement rack in the escapement directionalong the escapement path,

control means associated with said second relatively movable element forcontrolling the movement of said escapement dog about the point on saidsecond element, and

said control means being operable in response to the movement of saidrelatively movable first and second elements in said one direction forpivotally moving said escapement dog from engagement with saidescapement rack and for preventing said escapement dog from slidingabout the point on said second element under the urging of said firstresilient biasing means.

4. In a business machine according to claim 3, said control meanscomprising:

a control member associated with said second relatively movable elementand being supported for pivotal movement about the point on said secondelement,

said control member being pivotally movable about the point on saidsecond element for acting on said escapement dog to disengage saidescapement dog from said escapement rack and to block sliding movementof said escapement dog about the point on said second element under theurging of said first resilient biasing means, and

said control member being in frictional cooperation with said onerelatively movable element for pivotally moving said escapement dog fromengagement with said escapement rack in response to relative movment insaid one direction between the relatively movable first and secondelements.

5. In a business machine according to claim 3, the

combination further comprising:

a tabulating means including a tabulating member movable from a restposition to an actuated position in response to the actuation of atabulation mechanism, and

said control means being operable in response to the movement of saidtabulating member for the rest position to the actuated position forpivotally moving said escapement dog for disengagement with saidescapement rack to permit relative movement between the relativelymovable first and second elements in the escapement direction along; theescapement path and for preventing said escapement combination furthercomprising:

a trip lever associated with said second element for disengaging saidescapement dog from said escapement rack,

said trip lever including pivotally and slidably supported about thepoint on said second element for pivotal movement to disengage saidescapement dog from said escapement rack and for slidable movement alongthe escapement path,

a second resilient biasing means for urgining said trip lever in apivotal direction to prevent disengagement of said escapement dog fromsaid escapement rack and for urging said trip lever along the escapementpath in the same direction as said first resilient biasing means urgessaid escapement dog, and

said escapement dog having a projection formed thereon for engaging saidtrip lever to prevent sliding movement of said trip lever along theescapement path under the urging of said second resilient biasing meansin response to said escapement dog being moved pivotally about the pointon said second element by the operation of said control means.

7. In a business machine according to claim 6, said control meanscomprising:

a control member associated with said second relatively movable elementand being supported for pivotal movement about the point on said secondelement,

said control member being pivotally movable about the point on saidsecond element for acting on said escapement dog to disengage saidescapement dog from said escapement rack and to block sliding movementof said escapement dog about the point on said first element under theurging of said first resilient biasing means, and

said control member being in frictional cooperation with said firstrelatively movable element for pivotally moving said escapement dog inresponse to free movement between the relatively movable first andsecond elements in said one direction.

8. In a business machine according to claim 7, the

combination further comprising:

a tabulating means including a tabulating member operably connected withsaid control member and movable from a rest position to an actuatedposition in response to the actuation of a tabulation mechanism, and

said control member being pivotally movable about the point on saidsecond element in response to the movement of the tabulating member fromthe rest position to the actuated position for acting on said escapementdog to disengage said escapement dog from said escapement rack to permitrelative movement between the relatively movable first and secondelements in the escapement direction along the escapement path and forblocking said escapement dog from sliding about the point on said secondelement under the urging of said first resilient biasing means,

9. In a business machine having relatively movable first and secondelements, the combination comprising:

an escapement rack having teeth formed thereon and being associated withsaid first element for relative movement therewith along a predeterminedescapement path,

an escapement dog for permitting free movement between the relativelymovable first and second elements in one direction along the escapementpath and for controlling relative movement between the relativelymovable first and second element in an escapement direction oppositesaid one direction along the escapement path,

said escapement dog having a tooth for engaging the teeth of saidescapementrack and being associated with said second element,

said escapement dog being pivotally and slidably supported about a pointon said second element for pivotal movement into engagement with saidescapement rack and for slidable movement along the escapement path,

a first resilient biasing means for urging said escapement dog intoengagement with said escapement rack and for urging said escapement dogagainst the movement of said escapement rack in the escapement directionalong the escapement path,

a control member associated with said second relatively movable elementfor controlling the movement of said escapement dog about the point onsaid second element,

said control member being pivotally supported about the point on saidsecond element for acting on said escapement dog to disengage saidescapement dog from said escapement rack and to block sliding movementof said escapement dog about the point on said second element inresponse to the urging of said first resilient biasing means,

a tabulating means incuding a tabulating member operably connected withsaid control member abd movable from a rest position to an actuatedposition in response to the actuation of a tabulating mechanism, and

said control member being pivotally movable about the point on saidsecond element in response to the movement of the tabulating member fromthe rest position to the actuated position for acting on said escapementdog to disengage said escapement dog from said escapement rack to permitrelative movement between the relatively movable first and secondelements in the escepament direction along the escapement path and forblocking said escapement dog from sliding about the point on said secondescapement under the urging of said first resilient biasing means.

10. In a business machine according to claim 9, the combination furthercomprising:

a trip lever associated with said second element for disengaging saidescapement dog from said escapement rack,

said trip lever being pivotally and slidably supported about the pointon said second element for pivotal movement to disengage said escapementdog from said escapement rack and for slidable movement along theescapement path,

a second resilient biasing means for urging said trip lever in a pivotaldirection to prevent disengagement of said escapement dog from saidescapement rack and for urging said trip lever along the escapement pathin the same direction as said first resilient biasing means urges saidescapement dog, and

said escapement dog having a projection formed thereon for engaging saidtrip lever to prevent sliding movement of said trip lever along theescapement path in response to said escapement dog being moved pivotallyabout the point on said second element by the operation of said controlmember.

11. In a business machine according to claim 9, said control memberbeing in frictional cooperation with said one relatively movable elementfor pivotally moving said escapement dog from engagement with saidescapement rack in response to the relative movement in said onedirection between the relatively movable first and second elements.

12. In a business machine according to claim 11, the combination furthercomprising:

a carriage release mechanism having a member associated with said firstelement and being selectively movable from a normal position to anoperated position for acting on said control member, and

said control member being pivotally movable about the point on saidsecond element in response to the movement of said carriage releasemember from the normal position to the operated position for acting onsaid escapement dog to disengage said escapement dog from saidescapement rack to permit relative movement between the relativelymovable first and second elements in the escapement direction along theescapement path and for blocking said escapement dog from sliding aboutthe point on said second element under the urging of said firstresilient biasing means.

. UNETED STATES PATENT OFFiCE CEBTEFICATE 0F CORRECTION Patent No. 3,752,289 Dated August 14, 1973 Inventor-(s) Manfred Link It is certifiedthat error appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

Column 1, line 46, for "es-capement" read --escapement--. Column 2, linel4, for "quit" read --quiet- Column 3, line 52, for "mechanism" read-for-. Column 4, line 3, for "teetch" read --teeth--; line 11, delete--release-; line 46, for "near"read --nears-; line 56, for "convention"read --conventional--. Column 5, line 26, after "below" insert line 56,before "lever" insert --deconditi0ning-- Column 6, line 35, for "blcok"read --block-- Column 7, line 61, for "for" read --from-- Column 8, line9, for "including" read --being--. Column 9, line 37, for "abd" read--and--; line 51, for "escapement" read -element-- Signed and sealedthis 25th day or December 1973.

(SEAL) Attest:

EDWARDMJLETCHERJR. RENE D. TEGTl [EYER Attesting Officer ActingCommissioner of Patents USCOMM-DC 60376-P6D u.s. sovznmngwr PRINTINGOFFIICE: I969 0-356-334.

FORM Po-mso (10-59)

1. In a business machine having relatively movable first and secondelements, the combination comprising: an escapement rack having teethformed thereon and being associated with said first element for relativemovement therewith along a predetermined escapement path, an escapementdog for permitting free movement between the relatively movable firstand second elements in one direction along the escapement path and forcontrolling relative movement between the relatively movable first andsecond elements in an escapement direction opposite said one directionalong the escapement path, said escapement dog having a tooth forengaging the teeth Of said escapement rack and being associated withsaid second element, said escapement dog being pivotally and slidablysupported about a point on said second element for pivotal movement intoengagement with said escapement rack and for slidable movement along theescapement path, a first resilient biasing means for urging saidescapement dog into engagement with said escapement rack and for urgingsaid escapement dog against the movement of said escapement rack in theescapement direction along the escapement path, a control memberassociated with said second relatively movable element and pivotallysupported about the point on said second element, and said controlmember being pivotally movable about the point on said second elementfor acting on said escapement dog to blcok sliding movement of saidescapement dog about the point on said second element in response to theurging of said first resilient biasing means and then disengage saidescapement dog from said escapement rack.
 2. In a business machineaccording to claim 1, the combination further comprising: a trip leverassociated with said second element for disengaging said escapement dogfrom said escapement rack, said trip lever being pivotally and slidablysupported about the point on said second element for pivotal movement todisengage said escapement dog from said escapement rack and for slidablemovement along the escapement path, a second resilient biasing means forurging said trip lever in a pivotal direction to prevent disengagementof said escapement dog from said escapement rack and for urging saidtrip lever along the escapement path in the same direction as said firstresilient biasing means urges said escapement dog, and said escapementdog having a projection formed thereon for engaging said trip lever toprevent sliding movement of said trip lever along the escapement pathunder the urging of said second resilient biasing means in response tothe escapement dog being moved pivotally about the point on said secondelement by the operation of said control member.
 3. In a businessmachine having relatively movable first and second elements, thecombination comprising: an escapement rack having teeth formed thereonand being associated with said first element for relative movementtherewith along a predetermined escapement path, an escapement dog forpermititng free movement between the relatively movable first and secondelements in one direction along the escapement path and for controllingrelative movement between the relatively movable first and secondelements in an escapement direction opposite said one direction alongthe escapement path, said escapement dog having a tooth for engaging theteeth of said escapement rack and being associated with said secondelement, said escapement dog being pivotally and slidably supportedabout a point on said second element for pivotal movement intoengagement with said escapement rack and for slidable movement along theescapement path, a first resilient biasing means for urging saidescapement dog into engagement with said escapement rack and for urgingsaid escapement dog against the movement of said escapement rack in theescapement direction along the escapement path, control means associatedwith said second relatively movable element for controlling the movementof said escapement dog about the point on said second element, and saidcontrol means being operable in response to the movement of saidrelatively movable first and second elements in said one direction forpivotally moving said escapement dog from engagement with saidescapement rack and for preventing said escapement dog from slidingabout the point on said second element under the urging of said firstresilient biasing means.
 4. In a business machine according to claim 3,said control means comprising: a control member associated with saidsecond relatively movable element and being supported for pivotaLmovement about the point on said second element, said control memberbeing pivotally movable about the point on said second element foracting on said escapement dog to disengage said escapement dog from saidescapement rack and to block sliding movement of said escapement dogabout the point on said second element under the urging of said firstresilient biasing means, and said control member being in frictionalcooperation with said one relatively movable element for pivotallymoving said escapement dog from engagement with said escapement rack inresponse to relative movment in said one direction between therelatively movable first and second elements.
 6. In a business machineaccording to claim 3, the combination further comprising: a trip leverassociated with said second element for disengaging said escapement dogfrom said escapement rack, said trip lever including pivotally andslidably supported about the point on said second element for pivotalmovement to disengage said escapement dog from said escapement rack andfor slidable movement along the escapement path, a second resilientbiasing means for urgining said trip lever in a pivotal direction toprevent disengagement of said escapement dog from said escapement rackand for urging said trip lever along the escapement path in the samedirection as said first resilient biasing means urges said escapementdog, and said escapement dog having a projection formed thereon forengaging said trip lever to prevent sliding movement of said trip leveralong the escapement path under the urging of said second resilientbiasing means in response to said escapement dog being moved pivotallyabout the point on said second element by the operation of said controlmeans.
 7. In a business machine according to claim 6, said control meanscomprising: a control member associated with said second relativelymovable element and being supported for pivotal movement about the pointon said second element, said control member being pivotally movableabout the point on said second element for acting on said escapement dogto disengage said escapement dog from said escapement rack and to blocksliding movement of said escapement dog about the point on said firstelement under the urging of said first resilient biasing means, and saidcontrol member being in frictional cooperation with said firstrelatively movable element for pivotally moving said escapement dog inresponse to free movement between the relatively movable first andsecond elements in said one direction.
 8. In a business machineaccording to claim 7, the combination further comprising: a tabulatingmeans including a tabulating member operably connected with said controlmember and movable from a rest position to an actuated position inresponse to the actuation of a tabulation mechanism, and said controlmember being pivotally movable about the point on said second element inresponse to the movement of the tabulating member from the rest positionto the actuated position for acting on said escapement dog to disengagesaid escapement dog from said escapement rack to permit relativemovement between the relatively movable first and second elements in theescapement diRection along the escapement path and for blocking saidescapement dog from sliding about the point on said second element underthe urging of said first resilient biasing means.
 9. In a businessmachine having relatively movable first and second elements, thecombination comprising: an escapement rack having teeth formed thereonand being associated with said first element for relative movementtherewith along a predetermined escapement path, an escapement dog forpermitting free movement between the relatively movable first and secondelements in one direction along the escapement path and for controllingrelative movement between the relatively movable first and secondelement in an escapement direction opposite said one direction along theescapement path, said escapement dog having a tooth for engaging theteeth of said escapement rack and being associated with said secondelement, said escapement dog being pivotally and slidably supportedabout a point on said second element for pivotal movement intoengagement with said escapement rack and for slidable movement along theescapement path, a first resilient biasing means for urging saidescapement dog into engagement with said escapement rack and for urgingsaid escapement dog against the movement of said escapement rack in theescapement direction along the escapement path, a control memberassociated with said second relatively movable element for controllingthe movement of said escapement dog about the point on said secondelement, said control member being pivotally supported about the pointon said second element for acting on said escapement dog to disengagesaid escapement dog from said escapement rack and to block slidingmovement of said escapement dog about the point on said second elementin response to the urging of said first resilient biasing means, atabulating means incuding a tabulating member operably connected withsaid control member abd movable from a rest position to an actuatedposition in response to the actuation of a tabulating mechanism, andsaid control member being pivotally movable about the point on saidsecond element in response to the movement of the tabulating member fromthe rest position to the actuated position for acting on said escapementdog to disengage said escapement dog from said escapement rack to permitrelative movement between the relatively movable first and secondelements in the escepament direction along the escapement path and forblocking said escapement dog from sliding about the point on said secondescapement under the urging of said first resilient biasing means. 10.In a business machine according to claim 9, the combination furthercomprising: a trip lever associated with said second element fordisengaging said escapement dog from said escapement rack, said triplever being pivotally and slidably supported about the point on saidsecond element for pivotal movement to disengage said escapement dogfrom said escapement rack and for slidable movement along the escapementpath, a second resilient biasing means for urging said trip lever in apivotal direction to prevent disengagement of said escapement dog fromsaid escapement rack and for urging said trip lever along the escapementpath in the same direction as said first resilient biasing means urgessaid escapement dog, and said escapement dog having a projection formedthereon for engaging said trip lever to prevent sliding movement of saidtrip lever along the escapement path in response to said escapement dogbeing moved pivotally about the point on said second element by theoperation of said control member.
 11. In a business machine according toclaim 9, said control member being in frictional cooperation with saidone relatively movable element for pivotally moving said escapement dogfrom engagement with said escapement rack in response to the relativemovement in said one direction between the relatively movable first andseconD elements.
 12. In a business machine according to claim 11, thecombination further comprising: a carriage release mechanism having amember associated with said first element and being selectively movablefrom a normal position to an operated position for acting on saidcontrol member, and said control member being pivotally movable aboutthe point on said second element in response to the movement of saidcarriage release member from the normal position to the operatedposition for acting on said escapement dog to disengage said escapementdog from said escapement rack to permit relative movement between therelatively movable first and second elements in the escapement directionalong the escapement path and for blocking said escapement dog fromsliding about the point on said second element under the urging of saidfirst resilient biasing means.
 15. In a business machine according toclaim 3, the combination further comprising: a tabulating meansincluding a tabulating member movable from a rest position to anactuated position in response to the actuation of a tabulationmechanism, and said control means being operable in response to themovement of said tabulating member for the rest position to the actuatedposition for pivotally moving said escapement dog for disengagement withsaid escapement rack to permit relative movement between the relativelymovable first and second elements in the escapement direction along theescapement path and for preventing said escapement dog from slidingabout the point on said second element under the urging of said firstresilient biasing means.